This document provides guidance on excavation and confined space safety. It defines a confined space and lists hazards such as oxygen-deficient atmospheres. It recommends testing the atmosphere before entry and having emergency procedures in place. The document also discusses trench safety, noting that trench collapses can occur without warning regardless of depth. It lists general requirements for excavations such as establishing utility locations, providing safe means of exit for deep trenches, using protective garments near traffic, and preventing exposure to harmful atmospheres. Proper shoring, sloping or bracing of excavations is emphasized.